Benchmark: JavaScript spread operator vs Object.assign performance vs property add

Tests:

Using the spread operator
let firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } firstObject = { ...firstObject, ...secondObject };
Using Object.assign
let firstObject = { sampleData: 'Hello world' } firstObject = Object.assign(firstObject, { moreData: 'foo bar' });
add
const firstObject = { sampleData: 'Hello world' } firstObject.moreData = 'foo bar'

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Using the spread operator
Using Object.assign
add

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.96 YaBrowser/20.4.0.3443 Yowser/2.5 Safari/537.36

Browser/OS: Yandex Browser 20 on Mac OS X 10.14.6

View result in a separate tab

Test name	Executions per second
Using the spread operator	17770810.0 Ops/sec
Using Object.assign	4747118.0 Ops/sec
add	680403500.0 Ops/sec

JavaScript spread operator vs Object.assign performance vs property add (version: 0)

Comparing performance of: Using the spread operator vs Using Object.assign vs add

Created: 3 years ago by: Guest

Jump to the latest result

Using the spread operator

Using Object.assign

add

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A